CN100484108C - Voice packet switching machine and switching system thereof - Google Patents

Voice packet switching machine and switching system thereof Download PDF

Info

Publication number
CN100484108C
CN100484108C CN 02808634 CN02808634A CN100484108C CN 100484108 C CN100484108 C CN 100484108C CN 02808634 CN02808634 CN 02808634 CN 02808634 A CN02808634 A CN 02808634A CN 100484108 C CN100484108 C CN 100484108C
Authority
CN
China
Prior art keywords
packet
data
voice
switching
processing circuit
Prior art date
Application number
CN 02808634
Other languages
Chinese (zh)
Other versions
CN1504039A (en
Inventor
J·叶
S·-Q·李
S·R·巴内斯
Original Assignee
桑特拉系统有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US09/792,265 priority Critical
Priority to US09/792,265 priority patent/US7006489B2/en
Application filed by 桑特拉系统有限公司 filed Critical 桑特拉系统有限公司
Publication of CN1504039A publication Critical patent/CN1504039A/en
Application granted granted Critical
Publication of CN100484108C publication Critical patent/CN100484108C/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00Packet switching elements
    • H04L49/60Hybrid or multiprotocol packet, ATM or frame switches
    • H04L49/606Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/64Hybrid switching systems
    • H04L12/6402Hybrid switching fabrics
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5656Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5665Interaction of ATM with other protocols
    • H04L2012/5667IP over ATM
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671Support of voice

Abstract

一种话音分组交换系统包括可操作来在传送话音数据分组的多个信道之间交换的至少一个分组交换结构,耦合到该分组交换结构并且可操作来在所述话音数据分组与多个话音数据流之间转换的至少一个话音业务模块,以及耦合到所述至少一个话音业务模块的时分复用交换结构。 A voice packet switching system comprising at least one packet switching fabric operable to communicate voice between a plurality of channels of data packet exchange, coupled to the packet switch fabric and operable to a plurality of data packets with voice data in the voice at least one stream conversion between voice services module, and switching time division multiplex structure is coupled to at least one of the voice services module.

Description

话音分组交换机和交换系统 Voice packet switch and the switching system

技术领域 FIELD

本发明涉及电信设备,并且更具体而言,本发明涉及话音分组交换系统和方法。 The present invention relates to telecommunications devices and, more particularly, the present invention relates to voice packet switching system and method. 背景技术 Background technique

电信网发展的当前趋势集中在利用新兴的基于分组的数据网来代 Telecommunication network development focus on current trends in the use of the emerging packet-based data network to represent

替传统的公共交换电话网(PSTN)。 For traditional public switched telephone network (PSTN). 存在多个对于这一趋势的贡献因素。 There are several contributing factors to this trend. 数据业务量大大超过话音业务量并且这个差距继续增加而没有衰减。 Data services much more than voice traffic and the gap continues to increase without attenuation. 研究表明话音将只构成总电信业务量的非常小的一部分。 Studies have shown that voice will only constitute a very small part of the total communication business volume. 此外, 数据网固有地对于支持各种话音和数据业务更灵活并且具有支持目前通过PSTN传送的所有业务的技术潜能。 Further, the data network to support a variety of inherently voice and data services and have a more flexible support for all current traffic transmitted over the PSTN technique potential.

需要几年时间来解决技术问题,从而数据网能够具有PSTN的较高质量和可靠性。 It takes years to resolve the technical problem, so that the data network PSTN can have high quality and reliability. 同时,PSTN与快速发展的数据网将继续共存。 Meanwhile, PSTN and the rapid development of data networks will continue to co-exist. 为了便于话音技术从PSTN向分组网移动并且使两种网络对于话音业务互操作,网络运营商正在采用话音媒体网关。 To facilitate voice from PSTN to mobile networking technology and the divided two networks interoperate for voice services, network operators are using the voice media gateways. 话音媒体网关将话音信号在时分复用(TDM)脉沖编码调制(PCM)和数据分组格式之间转换,所述数据分組格式或者是异步转移模式(ATM)或者是互联网协议上的话音(VoIP)。 Voice media gateway voice signals between time division multiplex (TDM) pulse code modulation (PCM) and a data packet format conversion, the data packet format, or asynchronous transfer mode (ATM) or voice over Internet Protocol (VoIP) . 因此,话音媒体网关目前用于将数据网与PSTN桥接,但是不执行必要的交换功能。 Therefore, voice media gateways are currently used to bridge the data network and the PSTN, but does not perform the necessary switching functions. 尽管是必要的,但是这种类型的转接网是不经济的,这是因为它引入了加倍的网元并且增加了操作和维护网络的成本。 Although it is necessary, but this type of transit network is not economical, because it introduces a doubling of network elements and increased operating and maintenance costs of the network.

发明内容 SUMMARY

为解决以上技术问题,本发明的话音分组交换机包括:用于在多条ATM传输链路上接收和发送数据分组和用于从ATM数据分组中提取数据并且将提取的数据插入到预定协议的数据帧中的多个ATM分组处理电路;以及时隙交换机,其被耦合到所述多个ATM分组处理电路并且被配置来进行数据帧和数据的DSO级别和其它每话音信道级别的交换, 所述数据帧是从ATM分組处理电路接收的数据帧,所述数据是通过多条PCM传输链路接收和发送的复用PCM数据;其中所述话音分组交换机被配置作为一个PSTN网络交换单元以及桥接PSTN网络和基于分组的网络的网关来操作。 To solve the above technical problem, the voice packet switch of the present invention comprises: means for receiving and transmitting data packets and means for extracting data from the ATM data packets and insert the extracted data into a predetermined protocol over a plurality of ATM data transmission link a plurality of ATM packet processing circuits in the frame; and the time slot switch, which is coupled to the plurality of ATM packet processing circuits and configured for data frames and data of other levels and each DSO voice channel level switching, the a data frame is a data frame received from the ATM packet processing circuits, said data by multiplexing a plurality of PCM transmission links by receiving and transmitting the PCM data; wherein said voice packet switch is configured as a PSTN network switching element and a bridge PSTN a packet-based network and the network gateway to operate.

本发明还提供一种交换系统,包括:至少一个被配置来处理通过至少一条分組传输链路接收和发送的非TDM数据分组的分组处理电路; 以及一个交换装置,该交换装置具有:至少一个笫一信道,被配置来通过所述至少一条分组传输链路接收和发送非TDM数据分组;以及至少一个笫二信道,被配置来通过所述至少一奈非分组传输链路接收和发送复用TDM数据;其中所述交换装置被配置来在所述至少一个第一信道和至少一个笫二信道之间进行DSO级别和其它每话音信道级别的交换;其中所述交换系统被配置来作为PSTN网络交换单元和桥接PSTN 网络和基于分组的网络之间的网关进行操作。 The present invention also provides a switching system, comprising: at least one configured to process at least one packet transmission link and the packet processing circuit receiving the non-TDM data packet transmitted; and a switching means, the switching means having: at least one Zi a channel configured to pass the at least one packet transmission link and transmit non-TDM data received packet; Zi two and at least one channel configured to pass the at least one packet transmission link nelfinavir receive and transmit multiplexed TDM data; wherein said switching means is arranged to between the at least one first channel and at least one of said two Zi DSO level channel and other channels of each voice switching level; wherein the switching system is configured as a PSTN network switching and PSTN networks and bridging units operate based gateway between the network packet.

根据本发明,话音分组交换机提供端到端话音交换,而与主叫和被叫方使用的编码、复用或者传输协议以及沿着话音连接路径的交换机间中继线无关。 According to the present invention, a voice packet switch to-end voice switching, the use of the calling and called party coding, multiplexing, or transmission protocols and inter-switch trunks independent voice connection along the path. 话音分组交换还利用所有的话音编码和压缩方案、 物理层传输协议、接入协议和中继协议来进行操作。 Voice packet switching also use all voice encoding and compression schemes, physical layer transmission protocols, access protocols, and trunking protocols to operate. 本发明的一个重要方面是分离在分组交换网上交换话音中的三个关键功能:分组处理、 数字信号处理和交换。 An important aspect of the present invention is an isolated line switching in the packet-switched voice in the three key functions: packet processing, digital signal processing and switching. 本发明的话音分组交换允许以对于高密度应用最成本有效的方式来实现每个关键功能,诸如在中央局中。 Voice packet switching allows the present invention in a manner for high density applications to achieve the most cost-effective of each function key, such as the central office. 此外,可以利用互相独立的最先进水平的技术来实现每个功能。 In addition, each function can be implemented independently of each other using the most advanced level of technology. 从话音分组交换机中除去回波消除和话音压缩/解压缩功能所带来的另一个优点是提高的话音保真度和回波消除质量。 Removed from the voice packet switch echo cancellation and voice compression / decompression function brings another advantage is improved voice fidelity and echo cancellation quality. 此外,还消除了在话音传输中与抖动緩存相关的严重的端到端延迟。 In addition, in speech transmission also eliminates the jitter buffer associated with severe end to end delay. 关键在于消除沿着话音连接路径的中间交换机上的话音压缩/解压缩循环。 The key is to eliminate the voice on the voice connection path intermediate switch along the compression / decompression cycle.

在本发明的一个实施例中,交换系统包括与至少一条分组传输链路接口的至少一个分组处理电路。 In one embodiment of the present invention, the switching system comprising at least one packet processing circuit and the at least one packet transmission link interface. 该交换系统还包括一个耦合到所述至少一个分组处理电路的交换结构,从而该分组交换结构可操作来在通过至少一条分组传输链路接收和发送数据的信道与通过由所述交换结构接口的至少一条非分组传输链路接收和发送数据的信道之间交换。 The switching system further comprises a switch fabric coupled to the at least one packet processing circuit, whereby the packet switching fabric operable to receive and transmit data through at least one packet transmission link channel interface by said switching structure at least one non-packet transmission channel between the receiving and sending data link exchange.

在本发明的另一个实施例中,交换系统包括至少一个与笫一数据业务量接口的分组处理电路,所述第一数据业务量是被使用第一传输协议接收和发送的以第一协议的形式。 In another embodiment of the present invention, a packet switching system comprising at least a data processing circuit Zi traffic interface, the first data traffic is received and transmitted using a first transmission protocol to the first protocol form. 所述交换系统还包括一个耦合到至少一个分组处理电路的交换结构,从而该交换结构可操作来在耦合到笫一数据业务量的信道与耦合到第二数据业务量的信道之间交换,所述第二数据业务量是被使用由所述交换结构接口的第二传输协议接收和发送的以笫二协议的形式。 The switching system further comprises a handle coupled to the at least one packet switching fabric circuits, so that the switch fabric is operable to exchange data between the second traffic channel in Zi coupled to a data traffic channel and coupled to the said second traffic data is transmitted and received by the use forms a second transmission protocol of the interface to the switch fabric Zi two protocols.

在本发明的另一个实施例中,话音分组交换机包括多个可操作来 In another embodiment of the present invention, a voice packet switch includes a plurality of operable

通过多条ATM传输链路接收和发送数据分组并且可操作来从ATM数据分組中提取数据并且将所提取的数据插入到预定协议的数据帧中的多个ATM分组处理电路。 Receiving and transmitting data packets via a plurality of ATM transmission links and operable to extract data from the ATM data packets and insert the extracted data into a plurality of ATM packet processing circuits in data frames of a predetermined protocol. 所迷话音分组交换机还包括一个耦合到所述多个ATM分组处理电路并且可操作来交换从中接收的数据帧以及通过多条PCM传输链路接收和发送的复用的PCM数据的时隙交换机。 The fan further comprises a voice packet switch coupled to the plurality of ATM packet processing circuits and operable to exchange data frames received therefrom and the time slot multiplexing switch PCM data via a plurality of PCM transmission links of reception and transmission.

在本发明的另一个实施例中,话音分组交换机包括可操作来通过多条IP传输链路接收和发送数据分组并且可操作来从IP数据分组中提取数据并且将所提取的数据插入到预定协议的数据帧中的多个VoIP 分组处理电路。 In another embodiment of the present invention, a voice packet switch includes a plurality of through IP operable to receive and transmit data transmission links and operable to extract data packets from IP packet data and the extracted data into a predetermined protocol a plurality of data frames VoIP packet processing circuit. 所述话音分组交换机还包括一个耦合到所述多个VoIP 分組处理电路并且可操作来交换从中接收的数据帧以及通过多条PCM 传输链路接收和发送的复用的PCM数据的一个时隙交换机。 The voice packet switch further includes a plurality of VoIP packets coupled to said processing circuitry and operable to exchange data frames received therefrom and a time slot multiplexing switch by a plurality of PCM transmission links PCM data reception and transmission of .

在本发明的另一个实施例中, 一种交换话音分组的方法包括步骤: 接收通过至少一条分组传输链路发送的数据分组,处理所述数据分组, 并且将所迷数据分组转换成为预定数据链路协议的数据帧。 In another embodiment of the present invention, a method of switching voice packets includes the steps of: receiving at least one packet transmission link transmitted data packet, process the data packet, and the lost data packet is converted into a predetermined data link Road data frame protocol. 该数据帧被在一个交换结构的一个输入信道中接收,并且被输出到该交换结构的输出信道。 The data frame is a switched input channels in a receiving structure, and is output to the output channel of the switch fabric. 然后,数据帧被转换成为数据分组,并且被通过至少一条分组传输链路来发送。 Then, the data frame is converted into data packets, and is transmitted through the at least one packet transmission link.

附图说明 BRIEF DESCRIPTION

为了更完整地理解本发明及其目的和优点,现在参考附图来描述 For a more complete understanding of the present invention and its objects and advantages, reference is now be described,

本发明,在附图中: The present invention, in the drawings:

图1是采用本发明的话音分组交换系统的演化电信网的简化框图; 图2是根据本发明教导的话音分组交换系统的实施例的简化结构 FIG. 1 is a simplified block diagram of the evolution of packet-switched voice telecommunication network system according to the present invention; FIG. 2 is a simplified structure according to an embodiment of the teachings of the present invention, a voice packet switching system

框图; block diagram;

图3是根据本发明教导的话音分组交换系统的替代实施例的筒化框图; FIG 3 is a packet switched system cartridge of a block diagram of an alternative embodiment of the embodiment in accordance with the teachings of the present invention, a voice;

图4是根据本发明教导的话音分组交换系统的另一个实施例的简化框图;并且 FIG 4 is a simplified block diagram of an embodiment of the present invention according to another embodiment of the teachings of the voice packet switching system; and

图5是所述话音交换系统的一对一(any-to-any)功能以及利用相同的话音压缩编码方案对业务量进行分组的方法的图示。 FIG 5 is an illustration of one of the voice switching system (any-to-any) with the same functions and voice compression coding scheme for traffic grouping method. 具体实施方式 Detailed ways

通过参考附图l到5来最好地理解本发明的优选实施例及其优点, 类似的编号用于各图中类似和相应的部分。 5 with reference to the accompanying drawings by l best understood preferred embodiments and advantages of the embodiment of the present invention, like numerals used in the drawings in which like and corresponding parts.

图1是采用本发明的话音分组交换系统12-14的演化电信网10 的筒化框图。 Figure 1 is a voice of a block diagram of the present invention, the cartridge system 10 12-14 evolution of packet-switched telecommunication network. 演化网络10是操作在用于话音业务的公共交换电话网(PSTN) 16以及用于数据业务的异步转移模式网络(ATM) 18和互联网协议网络(IP) 20中的当前和下一代设备的聚结。 Evolving network 10 is operating in the public switched telephone network (PSTN) 16 for voice traffic, and asynchronous transfer mode network (ATM) 18 for data services and Internet Protocol network (IP) of the current and next-generation devices 20 poly knot. ATM是高带宽、 低延迟、面向连接的类似分组的交换和复用技术,用于支持数据、话音数据、视频数据、图像数据、多媒体数据业务量的传输。 ATM is a high bandwidth, low latency, connection-oriented packet switching and multiplexing technique similar to support data, voice data, video data, image data, multimedia data traffic transmission. ATM网络18采用诸如ATM交换机22、数字用户线接入复用器(DSLAM) 24和综合接入设备(IAD) 26的设备。 18 using the ATM network 22, a digital subscriber line access multiplexer (DSLAM) 24, and integrated access devices (IAD) apparatus such as an ATM switch 26. ATM网络18还包括本发明的一个或多个话音分组交换机12用于在ATM网络中交换单独的复用的话音流。 ATM network 18 further includes one or more voice packet switch of the present invention 12 for exchanging voice individual multiplexed stream in the ATM network. 这里将话音流定义为在相同的话音连接中从一方到另一方的单向连续话音信号。 The voice stream is defined herein as the same speech connection from the one to the other in a continuous way voice signal.

ATM网络18经由话音媒体网关(MG)30和31耦合到PSTN 16。 ATM network 18 is coupled via voice media gateways (MG) 30 and 31 to the PSTN 16. PSTN 采用诸如类型5交换机32、类型4交换机(未示出)、数字回路载波34和信道处理单元(CB) 36的设备来路由选择和递送话音和数据业务量。 PSTN 32 using, type 4 switches (not shown), a switch device, such as Type 5 digital loop carrier 34 and the channel processing unit (CB) 36 to route and deliver voice and data selecting traffic. PSTN16还经由话音媒体网关40耦合到IP网络20以便在TDMPCM 与IP之间转换话音信号。 PSTN16 also coupled via voice media gateways 40 to the IP network 20 to convert voice signals between TDMPCM to IP. 除了本发明的话音分组交换系统14之外, IP网络20还采用诸如路由器42、 DSLAM 44和IAD 46的设备。 In addition the present invention other than the voice packet switching system 14, IP network 20 also uses, DSLAM 44 and devices such as routers 42 IAD 46 in. 使用本发明的话音分组交换系统,话音业务量能够被通过诸如目前被支持的IP和ATM协议的任何数据分组协议(VoX )传送。 The present invention voice packet switching system, voice traffic can be any data packets currently supported protocol such as IP and ATM protocols (VoX) transmission.

可以看到话音分组交换机可以作为两种完全不同形式的网络之间的接口设备,诸如ATM和IP网18和20之间的话音分组交换机14。 Voice packet switch can be seen as an interface device between two completely different types of networks, such as an ATM packet switch 14 and voice between 18 and 20 IP network. 话音媒体网关在演化网络10中的存在是由于它们集成到电信网中来解决引入话音分组交换系统之前的话音-数据接口问题。 Voice media gateways present in the evolution of network 10 due to their integration into the telecommunications network to solve the voice packet prior to the introduction of the voice switching system - Data interface issues. 在配置话音分组交换系统的情况下,当网络配置逻辑以及资金设备调度允许时,话音媒体网关最终可以被逐步淘汰。 In the case of the configuration voice packet switching system, when the network configuration allows the scheduling logic, and capital equipment, voice media gateways may be eventually phased out.

本发明的话音分组交换系统可操作来执行一对一交换,以便能够在任何编码和传输方案之间交换话音流。 Voice packet switching system according to the present invention is operable to perform one exchange to be able to exchange voice streams between any encoding and transmission schemes. 话音分组交换机可操作来终接入站信道,提取其中传送的话音信号并且将它放回到匹配出站信道中,而与入站和出站信道使用相同还是不同的编码和传输方案无关。 Voice packet switch is operable to terminate the channel access station, to extract a voice signal and transmitting it back to the discharge station to match the channel, using the inbound and outbound channels of the same or different independent coding and transmission schemes. 此外,甚至在很大程度上经济地执行这些功能。 In addition, even perform these functions largely economically. 因为在各话音流被复 Because the streams are multiplexed in the speech

用在一条单独连接上的方式中,TDM(时分复用)到AAL1 (ATM适配层类型1 )与AAL2 ( ATM适配层类型2 )到VoIP ( IP上的话音)之间存在基本的差别,所以本发明的话音分组交换机区分它们并且对于它们执行不同的操作。 Used in a single connection mode, TDM (time division multiplex) to AAL1 (ATM Adaptation Layer type 1) the presence of a basic difference from the AAL2 (ATM Adaptation Layer type 2) to the VoIP (voice over IP) between the , the voice packet switch of the present invention to distinguish them and to perform different operations thereof. 每个TDM信道或者AAL1连接只传送一个话音流,而每个AAL2连接可以传送240个同时的话音流,并且每条VoIP连接甚至可以传送更多。 Each TDM channel or AAL1 connection only transmits a voice stream, while each AAL2 connection may carry voice stream 240 simultaneously, and each VoIP connection may transmit even more. 本发明的话音分组交换系统可操作来对于话音流进 Voice packet switching system according to the present invention is operable to feed to the voice stream

的出站信道,然后将共享相同的下一个中继交换机的所有出站话音i 再复用到相同的出站AAL2或者VoIP连接。 Outbound channel, then all share the same next hop switch outbound voice i then multiplexed into the same outbound AAL2 or VoIP connections. 这样,可以将话音应用从对于最终用户关系很小或者很不重要的编码和传输方案中分离。 In this way, voice applications can be separated from the small or very important for the final coding and transmission schemes user relationship. 最后, 作为用于网络通信公司的中央局交换机,本发明的话音分组交换机可操作来随着话音端口密度的增加而经济地按比例增加。 Finally, as a central office switch for network communications company, voice packet switch of the present invention is operable to increase as the density of voice ports and economically scaled.

技术的当前发展水平不包括满足以上列举的需求的任何设备。 The current level of technological development does not include any devices listed above meet the demand. 例如,媒体网关只执行或者TDM与ATM之间的话音转换或者TDM与VoIP 之间的话音转换,而很少执行以上两种转换。 For example, media gateways only perform voice or conversion between TDM and ATM or between TDM-speech conversion and VoIP, but seldom more than two transformations performed. 此外,媒体网关不执行交换功能。 In addition, the media gateway does not perform switching functions. 目前,没有IP路由器或者ATM交换机在话音流被复用时执行单独的话音流交换。 Currently, no IP router or ATM switch performs individual voice stream switching when multiplexed voice stream. 目前的所有ATM交换机都只执行ATM格式的交换,并且IP路由器只在不同的IP端口之间交换IP分组。 All current ATM switch to perform switching ATM format only, and IP routers exchange only IP packets between different IP ports. 不执行话音流的复用。 Does not perform the multiplexing of the voice stream. 此外,IAD与DLC只在IP或者ATM与TDM之间转换话音流, 并且典型地不执行任何交换功能。 Further, IAD DLC converting a voice stream with only between IP and ATM or TDM, and typically does not perform any switching function. 下面参考附图2-5可以看到,本发明的话音分组交换系统和方法提供了将话音和数据通信聚合到未来的以数据为中心的电信网中的唯一解决方案。 2-5 can be seen below with reference to the accompanying drawings, the present invention is a voice packet switching system and method to provide voice and data communications to a unique solution polymerization future data-centric telecommunications network.

图2是根据本发明教导的话音分组交换系统60的实施例的简化基本结构框图。 FIG 2 is a block diagram showing a basic structure of a simplified embodiment of a system 60 according to the present invention, a packet-switched voice teachings. 话音分组交换系统60包括TDM交换结构62,它经由TDM 网络接口控制器(NIC) 64耦合到TDM传输链路。 Voice packet switching system 60 includes a TDM switch fabric 62, which is coupled via TDM network interface controller (NIC) 64 to the TDM transmission link. TDM交换结构62是具有DS0或者64Kbps带宽的信道尺寸的时隙交换机。 TDM switch fabric 62 is a channel or a DS0 64Kbps bandwidth size slot switch. ATM/IP交换结构66可操作来交换可变长度分组。 ATM / IP switch fabric 66 is operable to exchange a variable-length packets. 耦合到ATM/IP交换结构66的网络接口控制器68可操作来终接IP或者ATM链路。 Coupled to ATM / IP switch fabric 66 of the network interface controller 68 is operable to terminate IP or ATM links. 诸如VoIP 70、 AAL1和AAL2的话音服务模块是可操作来执行接口、分组处理和可选地话音压缩和回波消除的电路或者芯片。 Such as VoIP 70, AAL1, and AAL2 voice services module is operable to execute an interface, packet processing, and optionally voice compression and echo canceling circuits or chips. AAL1支持类型A业务量,类型A业务量是面向连接的固定比特率(CBR)的依赖于时间的业务量,诸如未压缩的数字化话音和视频数据。 AAL1 supports traffic type A, type A traffic is digitized voice and video data for a fixed bit rate connection (CBR) traffic is dependent on the amount of time, such as uncompressed. AAL2支持类型B业务量,类型B业务量是面向连接的可变比特率(VBR)的需要信源和信宿之间的精确定时的同步业务量,诸如被压缩的话音和视频业务量。 The precise timing synchronization between the traffic source and sink needs to support AAL2 traffic type B, type B traffic is connection-oriented variable bit rate (VBR), such as compressed voice and video traffic. 尽管这些话音业务模块被在图2中示为单独的逻辑块,但是它们也可以被集成和实现在一个单独的电路板或者各种配置中。 Although these voice service modules are shown in FIG. 2 as a separate logical block, but they may also be integrated and implemented in a single circuit board or a variety of configurations. 交换机60可操作来执行话音和数据格式与速度之间的一对一交换。 Switch 60 is operable to perform one exchange between the voice and data formats and speeds.

图3是根据本发明教导的话音分组交换系统80的实施例的简化框图。 FIG 3 is a simplified block diagram of an embodiment of a system 80 according to the present invention, a packet-switched voice teachings. 话音分组交换系统80是图2所示基本结构的简单易懂的实现。 Voice packet switching system 80 is a straightforward implementation of the basic configuration 2 shown in FIG. 话音分组交换系统80包括分别接口和处理AAL1、 AAL2和VoIP分组的AAL1分組处理(PP)电路或者芯片82、 AAL2分组处理电路或者芯片84和VoIP分组处理电路或者芯片86。 Voice packet switching system 80 includes AAL1 packet processing, respectively, and an interface processing (PP) circuits or chips AAL1, AAL2, and VoIP packets 82, AAL2 packet processing circuits or chips 84, and VoIP packet processing circuits or chips 86. AAL1分组处理电路82被经由回波消除电路或者芯片90和脉冲编码调制链路92耦合到时隙交换机88 或者TDM交换结构。 AAL1 packet processing circuit 82 or circuit chip 90 is eliminated and the echo pulse code modulation links coupled via a switch 88 or 92 to the slot TDM switch fabric. AAL2分组处理电路84经由回波消除电路94、话音压缩电路或者芯片96和脉冲编码调制/高级数据链路控制 AAL2 packet processing circuit 84 via the echo cancel circuit 94, voice compression circuits or chips 96 and a pulse code modulation / high-level data link control

(PCM/HDLC)链路98耦合到时隙交换机88。 (PCM / HDLC) link 98 is coupled to the switch 88 slots. HDLC是用于点到点和点到多点通信的链路层协议标准。 HDLC is a link layer protocol standard for point to point and point to multipoint communication. HDLC将分组数据封装到一个帧中,该帧具有包括诸如错误控制机制的各种控制信息的帧头部和尾部。 HDLC encapsulates packet data into a frame, the frame having a frame comprising a head and a tail, such as error control mechanisms of the various control information. HDLC 变体包括帧中继、平衡型链路接入规程(LAP-B)、链路接入过程数据信道(LAP - DC )、点到点协议(PPP )和同步数据链路控制(SDLC )。 HDLC variants include frame relay, link access procedure balanced (LAP-B), link access procedure data channel (LAP - DC), Point to Point Protocol (PPP), and synchronous data link control (the SDLC) . 使用数据链路层协议,每条话音连接一个比特流HDLC信道被用于通过时隙交换机88来互连两个AAL2和VoIP分组处理电路。 Using a data link layer protocol, one bit stream for each voice connection HDLC channels are used to interconnect two AAL2 and VoIP packet processing circuit 88 through the switch slot. 封装在AAL2信元或者VoIP分组中的已编码话音帧(或者小分组)被提取并且被放到HDLC帧中以便通过时隙交换机88交换。 Encapsulated in AAL2 cell or VoIP packet encoded voice frames (or mini-packets) are extracted and put in the HDLC frames for switching through time slot switch 88. 交换之后,这些话音帧被放回到出站AAL2信元或者VoIP分组中。 After switching, these voice frames are put back to the outbound AAL2 cells or VoIP packets. 用于寂静检测的寂静插入描述符(SID)消息可以使用不同的用户到用户指示(UUI)透明地传送通过标准ATM接口和时隙交换机8 8之间的AAL2分组处理电路84 , 以便传播通过网络。 For detecting silence silence insertion descriptor (SID) message may use a different user to user indication (the UUI) transferred transparently through AAL2 packet processing circuit 84 between a standard ATM interface and time slot switch 88, in order to spread through the network . AAL2分组处理电路84不执行业务特定会聚子层 AAL2 packet processing circuit 84 does not perform the service specific convergence sublayer

(SSCS)功能,所以SID消息和话音分组被同样对待。 (The SSCS) function, SID messages and voice packets are treated equally. HDLC信道开销包括用于AAL2头的两个字节、用于HDLC头的两个字节以及比特填充, 同时总的HDLC信道原始带宽被限制为64kbps。 HDLC channel overhead includes two bytes for AAL2 header, two bytes for the HDLC header, and bit stuffing, while the total HDLC channel raw bandwidth is limited to 64kbps. 如果PCM被用于通过AAL1传送话音流,则PCM流能够在它们自己的DS0TDM格式中传送通过来代替使用HDLC信道。 If PCM is used to transmit voice stream by AAL1, the PCM stream can be transmitted by their own DS0TDM format instead of using HDLC channels. 在这个实施例中选择HDLC协议,这是因为它被广泛实现并且许多商业现货供应的硬件和软件都是容易获得的。 Select the HDLC protocol in this embodiment, it is because it has been widely implemented and many commercial-shelf hardware and software are readily available. 如果额外的利益能够被给予,则其它恰当的协议也可以被使用。 If additional benefits can be given, other appropriate protocol can also be used. 在压缩之后,话音流不高于40Kbps。 After compression, a voice stream is not higher than 40Kbps. 话音有效负荷、HDLC开销和AAL2/VoIP 开销的总和在64Kbps之下。 Voice payload, the sum of HDLC overhead and AAL2 / VoIP overhead is under 64Kbps. 这个至关紧要的观察资料迫使使用时隙交换机88作为统一的交换结构来满足所有的话音流交换需求。 The crucial information forced observed using the time slot switch 88 as a unified switch fabric to meet all voice stream switching requirements.

在操作中,最好是在PCM中进行一对TDM业务量之间的交换。 Preferably exchanged between a pair of TDM traffic in the PCM operation. 一对ATM AAL1之间的交换最好是在PCM中进行。 The best exchange between one pair of ATM AAL1 is in PCM. 具有相同的自适应差分脉冲编码调制(ADPCM )编码子类型的任何AAL2/VoIP到AAL2/VoIP交换的组合都可以被使用直接PCM或HDLC来交换。 Combination with the same adaptive differential pulse code modulation (ADPCM) encoding subtype of any of AAL2 / VoIP to AAL2 / VoIP switching can be directly used to exchange PCM or HDLC. 如果直接PCM被选择, 则只有在已编码话音抽样的每个字节中的固定子集的比特被填充、处理和用于播放。 If direct PCM is chosen, only stator in each byte of the encoded voice sample in the set of bits is filled, processed, and for playing. 这个选项需要抖动緩存的激活。 This option requires activation jitter buffer. 如果HDLC被选择,则不需要抖动緩存。 If HDLC is selected, you do not need jitter buffer. 抖动緩存被用于在分组逐段通过电信网传播时消除随机分组延迟变化。 The jitter buffer is used to eliminate random packet delay variations as the packet propagates through the telecommunication network segment by segment. 因为来自同一话音对话的两个连续信元或分组的到达之间的时间间隔的随机变化,所以需要每个交换机设想最坏情况的延迟并且提供大的抖动緩存器。 Because the voice conversation from the same two consecutive cells randomly varying time intervals between the arrival of the cells or packets, each switch is required and the worst-case delay is contemplated to provide a large jitter buffer. 结果,累积的传输延迟对于跨越许多中继段的话音连接是非常重大的,对于收费的长途呼叫典型地就是这样。 As a result, the cumulative transmission delay for hops across many speech connection is very important for the long distance call charges is typically so. 此外,这个大延迟使得难以进行满意的回波消除,并且严重削弱话音对话的主观质量或者逼真度。 In addition, the large delay makes it difficult to carry out satisfactory echo cancellation, and seriously weakened subjective quality or fidelity voice dialogue. 因此,HDLC路径优于PCM。 Accordingly, HDLC path is better than PCM. 具有相同的非ADPCM压缩编码的任何AAL2/VoIP到AAL2/VoIP的组合都最好被使用HDLC来交换。 Any AAL2 / VoIP with the same, non-ADPCM compression-coded to AAL2 / VoIP compositions are preferably to be exchanged using HDLC. 最好在交换之前首先将业务量转换到PCM来执行具有不同的压缩编码的AAL2/VoIP到AAU/VoIP的任何组合。 Preferably before the exchange is first converted into PCM traffic having to perform any combination of the different compression-encoded AAL2 / VoIP to AAU / VoIP to. 对于具有话音压缩的AAL1/TDM到AAL2/VoIP,还最好在交换之前首先转换到PCM。 For a voice compression AAL1 / TDM to AAL2 / VoIP, also preferably prior to the conversion to the first exchange PCM. 如果话音压缩根本未被使用,则交换最好在PCM中进行。 If voice compression is not simply used, it is preferably carried out in the PCM exchange. 目标是通过使用任何一个标准化的数据链路协议来封装和通过时隙交换机88在统一PCM信道上传送被压缩的话音流来如果可能则避免在中间中继段中到PCM的重复转换。 Any object is achieved by using a standardized data link protocols to encapsulate and transmit time-slot switch in the unified channel PCM voice stream 88 is compressed, if possible, to avoid repetition intermediate hops to convert the PCM. 被选择的数据链路协议的优选的属性包括可变长度话音小分组的接受、不超过64Kbps的总带宽以及错误检测和恢复能力,诸如HDLC和类似的协议。 Preferred properties of the selected data link protocol include acceptance of variable length voice packet is small, does not exceed the total bandwidth, and error detection and recovery capabilities of 64Kbps, such as HDLC and similar protocols.

如果不能获得使用标准化数据链路协议来在统一PCM信道上传送被压缩的话音流这一选项,则必须在每个中继段上执行到PCM的转换, 从而在每个中继段都需要抖动緩存。 If you can not be obtained using the standardized data link protocol to the compressed voice stream transmitted this option in uniform PCM channels, it must be performed to PCM conversion on each hop, and thus need to dither each hop cache. 此外,每个压缩和解压缩循环引入了某个量的失真。 In addition, each compression and decompression cycle introduces a certain amount of distortion. 随着话音连接通过多个交换机的这种失真的积累对于话音质量的额外损害是相当大的。 With the voice connection of this distortion accumulated over several switches additional damage to the voice quality is quite large. 另一个缺点是非常高的成本或者在与集成分组处理、回波消除和话音压缩芯片或模块相关的热消散上的限制。 Another disadvantage is the very high cost or limitations on a integrated packet processing, echo cancellation and voice compression chips or modules associated heat dissipation. 一个集成芯片也几乎不适合于中央局应用,这是因为高单元成本、低密度以及热消散。 An integrated chip is hardly suited for a central office application because of high unit cost, low density, and heat dissipation.

考虑到朝向用于下一代网络的话音业务量的AAL2/VoIP的优势的当前趋势,本发明甚至更恰当。 Given the current trend towards superiority for voice traffic in next generation network AAL2 / VoIP, the present invention is even more appropriate. 在所述网络中,在每个网络中继段执行重复的回波消除和话音压缩/解压缩的过程是非常无效率、不必要和不利的(归因于质量降低)。 In the network, performing repetitive echo in each network hop and eliminate voice compression / decompression process is very inefficient, unnecessary and disadvantageous (due to quality degradation).

图4是根据本发明教导的被从数字信号处理中分离的话音分组交换系统120的另一个实施例的简化框图。 FIG 4 is a packet switched simplified block diagram of another system 120 according to an embodiment separated from the digital voice signal processing teachings of the invention. 话音分组交换系统120不包括昂贵的数字信号处理电路或者芯片,并且因此不执行回波消除或者话音压缩。 Voice packet switching system 120 does not include expensive digital signal processing circuits or chips and therefore does not perform echo cancellation or voice compression. 一条话音连接路径包括一个始发交换机、 一个终接交换机和中间交换机。 A voice connection path includes an originating switch, one terminating switch, and intermediate switches. 当话音压缩被使用时,它只是必须在始发交换机和终接交换机中进行而不必要在中间交换机中进行。 When voice compression is used, it must only be unnecessary in the intermediate switches in the originating switch and the terminating switch. 对于从话音分组交换 For switching from the voice packet

术动机,这:^为网络带宽的惊人和继续的增加、数据业务量的爆炸性增长以及话音在整个业务混合中逐渐缩小的百分比。 Surgery motivation, this: ^ amazing and continues to increase, the explosive growth in data traffic and voice throughout the business mix diminishing percentage of network bandwidth. 许多强制的数字信号处理功能以及可选择的话音压缩功能可以移动到用户端设备(CPE)中,这是因为包含分组处理、回波消除和话音压缩功能的集成芯片设备是容易获得的。 Many mandatory digital signal processing functions and the optional voice compression function may be moved to the customer premises equipment (CPE). This is because the packet processing comprising, echo cancellation and voice compression functions integrated chip devices are readily available. 这些芯片设备虽然不适合于中央局交换机, The chip equipment, although not suitable for central office switches,

但是对于其中高集成功能是有价值的但是密度不是一个重要考虑事项的CPE应用则是理想的。 But for which the high integration density is valuable but not an important matter to consider CPE application is ideal.

如图4所示,话音分组交换系统120包括AAL1分组处理电路122、 AAL2分組处理电路124和VoIP分组处理电路126。 As shown, the voice packet switching system 4120 includes an AAL1 packet processing circuits 122, AAL2 packet processing circuits 124 and VoIP packet processing circuit 126. AAL1分组处理电路122经由PCM数据链路130耦合到时隙交换机128。 AAL1 packet processing circuit 122 is coupled to the slot 128 via a PCM data link switch 130. AAL2分组处理电路124经由PCM/HDLC数据链路132耦合到时隙交换机128。 AAL2 packet processing circuit 124 is coupled to the switch 128 via the slot PCM / HDLC data link 132. VoIP分组处理芯片126经由PCM/HDLC数据链路来134耦合到时隙交换机128。 VoIP packet processing chips 134 are coupled to the slot 126 to the switch 128 via PCM / HDLC data link. 业务量#>乂用于未压缩话音流的自然的PCM格式或者用于被压缩话音流的诸如HDLC的标准数据链路协议而呈现给时隙交换机128并且被该时隙交换机128交换。 Traffic #> qe for natural uncompressed PCM format for the voice stream or the compressed voice stream standard data link protocol such as HDLC is presented to the slot 128 and the switch 128 is switched to the time slot switch. TDM时隙交换机128是话音分组交换系统120的整体结构的组成部分以便于实现必要的类型5功能,诸如会议通话桥接、用于法律实施行动的通信援助(CALEA)、操作员强插、音调产生、数字通告以及带内话音信令终接和拨号数字。 TDM time slot switch 128 is a voice packet switching system part of the overall structure 120 in order to achieve the necessary type 5 functions such as conference call bridging, Communications Assistance for Law Enforcement action (CALEA), operator barge, tone generation , digital announcements, and in-band voice signaling termination and dialed digits.

通过提供和/或配置网络,网络运营商可以在接入链路和中继线上建立独立的AAL2或者VoIP连接的组,每个组;陂为一个单独概况的话音信道而规定。 By providing and / or network configuration, the network operator can create a separate group of AAL2 or VoIP connection over the access links and the trunks, each group; Pei as a single voice channel and a predetermined profile. 一个概况是管理话音如何能够通过IP分组和ATM AAL2 信元传送的方案。 Profile managing a program capable of transmitting voice over IP packets and ATM AAL2 cells. 所述概况定义使用什么压缩编码、话音抽样或者帧的格式以及这些抽样或者帧如何被封装到IP/RTP(互联网协议/实时传送协议)分组或者ATM AAL2信元中。 The profile defines what compression encoding, or the frame of speech samples and the sample format or how frames are encapsulated into IP / RTP (Internet Protocol / Real-time Transport Protocol) packets or ATM AAL2 cells of these. 一个话音连接建立请求将传送一个规定概况的选择的参数。 Parameters a voice connection establishment request transmits a predetermined profile selection. 在建立话音连接路径中,沿着所述路径的每个话音分组交换机上的控制软件将从具有与来自入站信道的那些相同概况的组中选择一个恰当的匹配出站信道。 In establishing a voice connection path, along the control software on each voice packet switch of the path from the group selected from those having the same before the inbound channel in a proper matching outbound channel. 结果,话音连接的整个路径将使用相同的概况或者相同的压缩编码。 As a result, the entire path of the voice connection will use the same profile, or the same compression encoding. 图5示出了这个规定概念。 FIG. 5 shows a concept of this provision.

注意所建议的利用概况的划分不需要网络拓朴改变,它也不会必然影响话音呼叫的路由选择。 Note that the proposed use of profiles do not need to divide the network topology changes, it will not necessarily affect the routing of voice calls. 分离或者划分只在逻辑连接等级上进行。 Or separated only logically divided connection level. 在连接两个相邻的话音分组交换机的物理链路上,例如可以在接受话音呼叫之前提供两个或多个用于不同编码的AAL2/VoIP连接。 On the physical links connecting two adjacent voice packet switches, for example, provide two or more AAL2 / VoIP connections for different encoding prior to receiving a voice call.

因为较少DSP的话音分组交换结构带来减少的脚印尺寸和/或增加的端口密度,所以与用于交换机的外壳和热消散相关的成本被大大降低。 Because fewer DSP voice brought reduced footprint and / or increased port density packet switching structure, with the housing for dissipation of heat exchangers and associated costs are greatly reduced. 对于网络运营商的纯利益是在不动产、功耗以及空调费用方面的低得多的资本支出和正在进行的运营成本。 For net benefit network operators are in real estate, power and air conditioning costs are much lower capital expenditures and ongoing operating costs. 大大简化的硬件结构还惊人地提高了整个交换系统的固有可靠性。 Greatly simplified hardware architecture also surprisingly improves the inherent reliability of the entire switching system. 因为与DSP相关的成本大大高于与分组处理和交换相关的成本,所以本发明的话音分組交换机获得以任何给定密度的最大的经济节约。 Because the costs associated with DSP is significantly higher than the costs associated with packet processing and switching, the voice packet switch of the present invention obtained with the greatest density of any given economic savings.

本发明的话音分组交换机获得端到端话音交换,而与主叫方和被叫方使用的编码、复用或者传输方案以及沿着话音连接路径的交换机间中继线无关。 Voice packet switch of the present invention obtained end voice switching, using the calling party and the called party encoding, multiplexing, or transmission scheme, and does not relate to the trunk exchange along the speech path is connected. 话音分组交换机还可利用所有话音编码和压缩方案、 物理层传输协议、接入协议以及中继协议来操作。 Voice packet switch may also be utilized for all voice encoding and compression schemes, physical layer transmission protocols, access protocols, and trunking protocols to operate.

本发明的一个重要方面是在分组交换网上交换话音中的三个主要功能的分离:分组处理、数字信号处理(回波消除和话音压缩)以及交换。 An important aspect of the present invention is an isolated line switching in the packet-switched voice of the three main functions of: packet processing, digital signal processing (echo cancellation and voice compression), and switching. 在这样做时,本发明的话音分组交换机允许每个关键功能被以最成本有效的方式而为高密度应用来实现,诸如在中央局中。 In doing so, the voice packet switch of the present invention allows each key function to be the most cost-effective manner to achieve high-density applications, such as in a central office. 此外,每个功能可以被利用最先进水平的技术而相互独立地实现。 In addition, each function may be using the most advanced level of technology and implemented independently of each other. 从话音分 Points from the voice

组交换机中消除DSP功能的另一个优点是提高的话音保真度和回波消除质量。 Another advantage of eliminating DSP functionality group of switches is to improve voice fidelity and echo cancellation quality. 此外,还消除了与抖动緩存相关的话音传输中的显著的端到端延迟。 In addition, also eliminates a significant end voice transmission associated with jitter buffer delay.

本发明提供的成本利益可以被量化或者估计。 The present invention provides cost benefits can be quantified or estimated. 对于一个具有N个端口的交换机,有N-端口的接口电路和N2-端口的交换交叉点。 For a switch with N ports, there are N- port interface circuit and switching intersection N2- port. 业务提供商最关心的每个端口的成本是总成本除以N。 Cost per port service providers are most concerned about is the total cost divided by N. 因此,每个端口成本是每端口接口成本和N个交叉点成本的总和。 Thus, the cost per port cost is the sum of the interface and per port cost of N cross points. 在本发明的优选实施例中, TDM交换结构可以被以非常低的成本实现,这是因为它是筒单和成熟技术的缩放。 In a preferred embodiment of the present invention, the TDM switch fabric can be realized at very low cost, because it is a scaling of single cylinder and mature technologies. 本发明首先减少了对于话音压缩/解压缩和回波消除的需要,然后提供了另一个替代,其中数字信号处理接口部件被拆除到只剩下分组处理,无需更昂贵的话音压缩和回波消除电路。 The present invention first reduces the need for voice compression / decompression and echo canceling, and then offers another alternative where the digital signal processing interface components to be removed only packet processing without more expensive voice compression and echo cancellation circuit. 通过将二次复杂度放置到低成本TDM交换机中并且将线性复杂度放置在高成本部件中,本发明获得与高端口密度成比例的非常好的经济性。 By placing the quadratic complexity in the low cost TDM switch and the linear complexity in high cost components are placed, the present invention achieves high port density is proportional to a very good economy.

虽然利用上面的详细描述特别示出了描述了本发明,但是本领域技术人员应当理解,可以在不偏离本发明精神和范围的条件下在形式和细节上作出各种改变、修改、变更、变化和派生。 With the above detailed description while particularly shown and described with the present invention, those skilled in the art should be understood that various changes, modifications and changes in form and detail without departing from the spirit and scope of the invention, changes and derived.

Claims (26)

1. 一种话音分组交换机,包括:用于在多条ATM传输链路上接收和发送数据分组和用于从ATM数据分组中提取数据并且将提取的数据插入到预定协议的数据帧中的多个ATM分组处理电路;以及时隙交换机,其被耦合到所述多个ATM分组处理电路并且被配置来进行数据帧和数据的DSO级别和其它每话音信道级别的交换,所述数据帧是从ATM分组处理电路接收的数据帧,所述数据是通过多条PCM传输链路接收和发送的复用PCM数据;其中所述话音分组交换机被配置作为一个PSTN网络交换单元以及桥接PSTN网络和基于分组的网络的网关来操作。 1. A voice packet switch, comprising: means for receiving and transmitting data packets and means for extracting data from the ATM data packets and insert the extracted data into a predetermined multi-protocol data frames on a plurality of ATM transmission links an ATM packet processing circuits; and the time slot switch, which is coupled to the plurality of ATM packet processing circuits and configured for data frames and data of other levels and each DSO voice channel level switching, said frame data from data frames received ATM packet processing circuits, said data is obtained by multiplexing a plurality of PCM transmission link by transmitting and receiving PCM data; wherein said voice packet switch is configured as a PSTN network switching element and the bridge network and a packet-based PSTN network gateway to operate.
2. 根据权利要求1所述的话音分组交换机,其中所述多个ATM分组处理电路包括用于接收和发送AAL1信元的AAL1分组处理电路。 The voice packet switch as claimed in claim 1, wherein said plurality of ATM packet processing circuitry includes means for receiving and transmitting packets AAL1 AAL1 cell processing circuit.
3. 根据权利要求1所迷的话音分组交换机,其中所述多个ATM分组处理电路包括用于接收和发送AAL2信元并且用于从AAL2信元中提取数据并且将提取的数据插入到HDLC数据帧中来由所述时隙交换机交换的AAL2分组处理电路。 The voice data packet switch as claimed in claim 1 fans, wherein the plurality of ATM packet processing circuitry includes means for receiving and transmitting AAL2 cell and for extracting data from the AAL2 cell and is inserted into the extracted HDLC data the reason AAL2 packet frame processing switching circuit switches the time slot.
4. 根据权利要求1所述的话音分组交换机,其中所述多个ATM分组处理电路包括用于接收和发送VoIP数据分组并且用于从所述VoIP 数据分组中提取数据并且将所提取的数据插入到HDLC数据帧中来由所述时隙交换机交换的VoIP分组处理电路。 The voice data packet switch according to claim 1, wherein said plurality of ATM packet processing circuitry includes means for receiving and transmitting data packets and VoIP for extracting data from the VoIP data packets and insert the extracted the time slot exchange switch reason of the HDLC data frame to the VoIP packet processing circuit.
5. 根据权利要求1所述的话音分组交换机,还包括耦合在所述多个ATM分组处理电路和用于在ATM数据分组与复用PCM数据之间转换的时隙交换机之间的至少一个数字信号处理电路。 The voice packet switch according to claim 1, further comprising a plurality of ATM packet processing circuits and coupled to at least one digital data packets between the ATM and the multiplexed data conversion between PCM time slot switch The signal processing circuit.
6. 根据权利要求5所述的话音分组交换机,其中所述至少一个数字信号处理电路包括至少一个回波消除电路,用于消除来自被所述时隙交换机所交换的话音信道的回波。 The voice packet switch as claimed in claim 5, wherein said at least one digital signal processing circuit comprises at least one echo cancellation circuit for canceling echo from the voice channel is exchanged to the time slot switch.
7. 根据权利要求5所述的话音分组交换机,其中所述至少一个数字信号处理电路包括至少一个话音压缩电路,用于压缩被用来在所述时隙交换机所交换的话音信道中编码话音的数据。 The voice packet switch of claim 5, wherein said at least one digital signal processing circuit comprises at least one voice compression circuit for compressing the voice channel coding is used to switch the time slot of the exchanged voice data.
8. —种交换系统,包括:至少一个被配置来处理通过至少一条分组传输链路接收和发送的非TDM数据分组的分组处理电路;以及一个交换装置,该交换装置具有:至少一个第一信道,被配置来通过所述至少一条分组传输链路接收和发送非TDM数据分组;以及至少一个第二信道,被配置来通过所述至少一条非分组传输链路接收和发送复用TDM数据;其中所述交换装置被配置来在所述至少一个笫一信道和至少一个第二信道之间进行DSO级別和其它每话音信道级别的交换;其中所述交换系统被配置来作为PSTN网络交换单元和桥接PSTN 网络和基于分组的网络之间的网关进行操作。 8. - kind of exchange system, comprising: at least one configured to process at least one packet transmission link and the packet processing circuit receiving the non-TDM data packet transmitted; and a switching means, the switching means having: at least one first channel configured to pass the at least one packet transmission link and transmit non-TDM data received packet; and at least one second channel, the link is configured to receive and transmit multiplexed TDM data packet transmission of said at least one non-through; wherein the switching device is configured to perform each of the other levels and DSO voice channel level switching between the at least one Zi channel and at least one second channel; wherein the switching system is configured as a PSTN network switching element and gateway between the PSTN network and the bridging packet-based network operates.
9. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路用于提取通过所述至少一条分组传输链路接收的非TDM数据分组并且使用一个数据链路协议发送到所述交换装置。 9. The switching system of claim 8, wherein the at least one packet processing circuit for extracting the non-TDM data packets received at least one packet transmission link and transmit through a data link protocol used to exchange the device.
10. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路用于提取通过至少一条分组传输链路接收的压缩话音数据并且使用一个数据链路协议发送到交换装置进行交换。 10. The switching system according to claim 8, wherein the at least one packet processing circuit for extracting the compressed voice data using a data link protocol and transmitting to the switching means via at least one packet switched transmission link received.
11. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路用于提取通过至少一条分组传输链路接收的AAL2话音数据并且使用高级数据链路控制协议发送到交换装置进行交换。 11. The switching system according to claim 8, wherein the at least one AAL2 packet processing circuit for extracting voice data received through the at least one packet transmission link and transmit to the switching device uses level data link control protocol exchange.
12. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路用于提取通过至少一条分组传输链路接收的VoIP话音数据并且使用高级数据链路控制协议发送到交换装置进行交换。 12. The switching system according to claim 8, wherein the at least one VoIP packet processing circuit for extracting voice data received through the at least one packet transmission link and transmit to the switching device uses level data link control protocol exchange.
13. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路用于提取从所述交换装置接收的数据并且将所提取的数据插入到分组中以便通过至少一条分组传输链路进行发送。 13. A packet for transmission via at least one link of the switching system according to claim 8, wherein the at least one packet processing circuit for extracting the inserted packet data received from the exchange and supplies the extracted data send.
14. 根据权利要求8所述的交换系统,其中所迷至少一个分组处理电路用于提取从所述交换装置接收的话音数据并且将所提取的话音数据插入到AAL信元中以便通过至少一条分组传输链路进行发送。 14. A switching system according to claim 8, wherein the at least one packet processing circuit fans for extracting at least one packet from the voice data received by said switching means is inserted and the extracted voice data so as to AAL cell by transmission link transmitted.
15. 根据权利要求8所述的交换系统,其中至少一个分組处理电路用于提取从所述交换装置接收的话音数据并且将所提取的话音数据插入到VoIP分组中以便通过至少一条分组传输链路进行传输。 15. A switching system according to claim 8, wherein the at least one packet processing circuit for extracting from the voice data received by the exchange and inserted extracted voice data into VoIP packets for the at least one packet transmission link by transmission.
16. 根据权利要求8所述的交换系统,其中所述交换装置是时隙交换机交换装置。 16. The switching system according to claim 8, wherein said switching means switching the switch means is a slot.
17. 根据权利要求8所述的交换系统,其中所述交换装置用于交换复用的未压缩话音数据。 17. The switching system according to claim 8, wherein said switching means for switching compressed voice data is not multiplexed.
18. 根据权利要求8所述的交换系统,其中所述交换装置用于交换PCM数据。 18. The switching system according to claim 8, wherein said switching means for exchanging PCM data.
19. 根据权利要求8所述的交换系统,其中所述至少一条分组传输链路包括多条分组传输链路,所述多条分组传输链路包括复用的VoIP数据传输链路和复用的AAL2数据传输链路,所述复用的VoIP数据传输链路用于向和从所述交换装置传输包封有话音数据的IP分組, 所述复用的AAL2数据传输链路用于向和从所述交换装置传输AAL2分组,该AAL2分组承载了包封有话音数据的复用ATM信元。 19. The switching system according to claim 8, wherein the at least one packet transmission link includes a plurality of packet transmission links, said plurality of packet transmission links, including VoIP data transmission link and a multiplexed multiplexed AAL2 data transmission link, the multiplexed VoIP data transmission link for the AAL2 data transmission link and means for transmitting IP packets encapsulating the voice data from the exchange, for the multiplexed to and from transmitting the AAL2 packet switching device, which carries AAL2 packet multiplexed ATM cells encapsulated voice data.
20. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路包括至少一个用于与所述交换装置的至少一条ATM传输链路接口的AAL1分组处理电路,用于处理承载了包封有话音数据的ATM信元的AAL1分组。 20. A switching system according to claim 8, wherein the at least one packet processing circuit includes at least one AAL1 packet processing circuit and the switch for at least one ATM transmission link interface means for processing the packets carrying encloses voice data packets AAL1 ATM cell.
21. 根据权利要求8所述的交换系统,其中所述至少一个分組处理电路包括至少一个用于与所述交换装置的至少一条ATM传输链路接口的AAL2分组处理电路,用于处理承载了包封有话音数据的复用ATM 信元的AAL2分纽。 21. The switching system according to claim 8, wherein the at least one packet processing circuit includes at least one AAL2 packet processing circuit and the switch for at least one ATM transmission link interface means for processing the packets carrying New is sealed with a division multiplexed AAL2 ATM cells of voice data.
22. 根据权利要求8所述的交换系统,其中所述至少一个分组处理电路包括至少一个用于与至少一条IP传输链路接口的VoIP分组处理电路,用于处理包封有话音数据的IP分组。 22. The IP packet switching system according to claim 8, wherein the at least one packet processing circuit includes at least one VoIP packet processing circuit with at least one IP transmission link interface, for processing voice data encapsulated .
23. 根据权利要求8所迷的交换系统,还包括至少一个数字信号处理电路,该数字信号处理电路耦合在所述至少一个分组处理电路与所述交换装置之间并且用于在对应于所述至少一条分组传输链路的第一数据格式与对应于所述至少一条非分组传输链路的笫二数据格式之间进行转换。 23.8 fans switching system according to claim, further comprising at least one digital signal processing circuit, the digital signal processing circuit is coupled in between the at least one packet processing circuit and the switching means and for the corresponding converting the at least one packet transmission link between a first data format corresponding to said at least one non-packet transmission link Zi second data format.
24. 根据权利要求8所迷的交换系统,还包括至少一个数字信号处理电路,该数字信号处理电路耦合在所述至少一个分组处理电路与所述交换装置之间并且用于在对应于所述至少一条分组传输链路的压缩数据格式与对应于所述至少一条非分组传输链路的非压缩数据格式之间进行交换。 24.8 fans switching system according to claim, further comprising at least one digital signal processing circuit, the digital signal processing circuit is coupled in between the at least one packet processing circuit and the switching means and for the corresponding compressed data format of the at least one packet transmission link corresponding to said at least one non-compressed data exchanged between the non-packet transmission link format.
25. 根据权利要求24所迷的交换系统,其中所述至少一个数字信号处理电路包括至少一个回波消除电路,用于消除来自被所述交换装置所交换的话音信道的回波。 25.24 fans switching system according to claim, wherein said at least one digital signal processing circuit comprises at least one echo cancellation circuit for canceling echo from the voice channel switching means is exchanged.
26. 根据权利要求24所述的交换系统,其中所述至少一个数字信号处理电路包括至少一个话音压缩电路,用于压缩被用来对所述交换装置所交换的话音数据进行编码的数据。 26. The switching system according to claim 24, wherein said at least one digital signal processing circuit comprises at least one voice compression circuit is used for compressing the data encoded voice data exchanged by the exchange means.
CN 02808634 2001-02-23 2002-02-22 Voice packet switching machine and switching system thereof CN100484108C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US09/792,265 2001-02-23
US09/792,265 US7006489B2 (en) 2001-02-23 2001-02-23 Voice packet switching system and method

Publications (2)

Publication Number Publication Date
CN1504039A CN1504039A (en) 2004-06-09
CN100484108C true CN100484108C (en) 2009-04-29

Family

ID=25156298

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 02808634 CN100484108C (en) 2001-02-23 2002-02-22 Voice packet switching machine and switching system thereof

Country Status (6)

Country Link
US (2) US7006489B2 (en)
EP (1) EP1364499B1 (en)
CN (1) CN100484108C (en)
AT (1) AT435550T (en)
DE (1) DE60232781D1 (en)
WO (1) WO2002069588A2 (en)

Families Citing this family (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1269701B1 (en) * 2000-03-21 2004-11-10 Siemens Aktiengesellschaft Method for providing telephone services through xdsl connection lines
US6819678B2 (en) * 2000-12-21 2004-11-16 Nortel Networks Limited Interworking of dissimilar packet networks for telephony communications
US7006489B2 (en) * 2001-02-23 2006-02-28 Santera Systems, Inc. Voice packet switching system and method
JP3664109B2 (en) * 2001-06-29 2005-06-22 日本電気株式会社 Voice channel selection system, and a method thereof selected
US7630359B1 (en) * 2001-09-28 2009-12-08 At&T Corp. Technique for providing translation between the packet environment and the PSTN environment
US7934021B2 (en) 2002-08-29 2011-04-26 Broadcom Corporation System and method for network interfacing
US7177305B2 (en) * 2002-04-25 2007-02-13 Lucent Technologies Inc. Inter-switch telecommunications system for interconnecting packet-capable Time Division Multiplexed switches with non-packet-capable Time Division Multiplexed switches via an asynchronous transfer mode network
US20030231615A1 (en) * 2002-06-12 2003-12-18 Adc Telecommunications Israel Ltd. Virtual Connections for voice over digital subscriber lines
US8018838B2 (en) * 2002-06-25 2011-09-13 Tellabs Operations, Inc. Apparatus and method for protection switching in a network
US8010707B2 (en) * 2002-08-30 2011-08-30 Broadcom Corporation System and method for network interfacing
US7457277B1 (en) * 2002-09-20 2008-11-25 Mahi Networks, Inc. System and method for network layer protocol routing in a peer model integrated optical network
US7327725B2 (en) * 2002-11-27 2008-02-05 Alcatel Canada Inc. Method and apparatus capable of transferring very high data rates across a midplane or backplane
AU2002364496A1 (en) * 2002-12-27 2004-07-22 Telefonaktiebolaget Lm Ericsson (Publ). Tunnelling tdm traffic over mpls
US8254372B2 (en) * 2003-02-21 2012-08-28 Genband Us Llc Data communication apparatus and method
US7515605B2 (en) 2003-03-24 2009-04-07 Corrigent Systems Ltd Efficient transport of TDM services over packet networks
US20050135387A1 (en) * 2003-12-19 2005-06-23 International Internet Telecom, Inc. Modular gateway
US7606933B2 (en) * 2004-02-11 2009-10-20 Cray Canada Corporation Shared memory and high performance communication using interconnect tunneling
US8027265B2 (en) * 2004-03-19 2011-09-27 Genband Us Llc Providing a capability list of a predefined format in a communications network
WO2005089055A2 (en) * 2004-03-19 2005-09-29 Nortel Networks Limited Communicating processing capabilites along a communications path
US7729346B2 (en) 2004-09-18 2010-06-01 Genband Inc. UMTS call handling methods and apparatus
US7830864B2 (en) * 2004-09-18 2010-11-09 Genband Us Llc Apparatus and methods for per-session switching for multiple wireline and wireless data types
US7809128B2 (en) * 2004-10-07 2010-10-05 Genband Us Llc Methods and systems for per-session traffic rate policing in a media gateway
US8971898B2 (en) * 2004-10-22 2015-03-03 Genband Us Llc Mobility management apparatus and methods
US8213414B2 (en) * 2005-02-18 2012-07-03 Genband Us Llc Methods, systems, and computer program products for providing time division multiplexed (TDM) terminating service in a packet network
US20060221983A1 (en) * 2005-03-30 2006-10-05 Lucent Technologies Inc. Communications backbone, a method of providing a communications backbone and a telecommunication network employing the backbone and the method
US8228926B2 (en) * 2005-04-12 2012-07-24 Genband Us Llc Dynamic loading for signaling variants
US8259712B2 (en) * 2005-05-19 2012-09-04 Genband Us Llc Methods and apparatus for interconnection of media gateways
US7627004B2 (en) * 2005-05-26 2009-12-01 Cisco Technology, Inc. Transporting synchronization channel information across a packet network
US8483173B2 (en) * 2005-05-31 2013-07-09 Genband Us Llc Methods and systems for unlicensed mobile access realization in a media gateway
US7961739B2 (en) * 2005-07-21 2011-06-14 Genband Us Llc Systems and methods for voice over multiprotocol label switching
US7792150B2 (en) 2005-08-19 2010-09-07 Genband Us Llc Methods, systems, and computer program products for supporting transcoder-free operation in media gateway
US7835346B2 (en) * 2006-01-17 2010-11-16 Genband Us Llc Methods, systems, and computer program products for providing transcoder free operation (TrFO) and interworking between unlicensed mobile access (UMA) and universal mobile telecommunications system (UMTS) call legs using a media gateway
JP4545109B2 (en) * 2006-03-28 2010-09-15 京セラ株式会社 Communication path control device
CN101163175A (en) * 2006-10-11 2008-04-16 鸿富锦精密工业(深圳)有限公司;鸿海精密工业股份有限公司 Network voice device and service switch method thereof
EP2108193B1 (en) 2006-12-28 2018-08-15 Genband US LLC Methods, systems, and computer program products for silence insertion descriptor (sid) conversion
US20080240152A1 (en) * 2007-03-27 2008-10-02 Dell Products L.P. System And Method For Communicating Data For Display On A Remote Display Device
US20080298345A1 (en) * 2007-05-30 2008-12-04 Llija Hadzic Cross-connect for emulated circuit-base communications
JP2008306478A (en) * 2007-06-07 2008-12-18 Nec Corp Data transfer device, data transfer method, and data transfer program
US8908541B2 (en) * 2009-08-04 2014-12-09 Genband Us Llc Methods, systems, and computer readable media for intelligent optimization of digital signal processor (DSP) resource utilization in a media gateway
WO2011034090A1 (en) * 2009-09-18 2011-03-24 日本電気株式会社 Audio quality analyzing device, audio quality analyzing method, and program
EP2754273A4 (en) * 2011-09-09 2015-03-11 Ericsson Telefon Ab L M Protection group switching for circuit emulaton
US9787613B2 (en) 2015-06-09 2017-10-10 Avago Technologies General Ip (Singapore) Pte. Ltd. Decoupled packet and data processing rates in switch devices

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5375121A (en) 1991-08-28 1994-12-20 Fujitsu Limited ATM cell assembling and disassembling system and method

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6046999A (en) * 1996-09-03 2000-04-04 Hitachi, Ltd. Router apparatus using ATM switch
CA2217838C (en) * 1996-11-07 2003-07-29 At&T Corp. Wan-based voice gateway
US6026086A (en) * 1997-01-08 2000-02-15 Motorola, Inc. Apparatus, system and method for a unified circuit switched and packet-based communications system architecture with network interworking functionality
US5905873A (en) * 1997-01-16 1999-05-18 Advanced Micro Devices, Inc. System and method of routing communications data with multiple protocols using crossbar switches
US5999529A (en) * 1997-09-16 1999-12-07 Nortel Networks Corporation Method and apparatus for interworking ATM adaptation layer formats
US6147988A (en) * 1997-10-27 2000-11-14 Bell Atlantic Network Services, Inc. IP packet switching in a Telco switch
US20010012293A1 (en) 1997-12-02 2001-08-09 Lars-Goran Petersen Simultaneous transmission of voice and non-voice data on a single narrowband connection
US6498791B2 (en) * 1998-04-03 2002-12-24 Vertical Networks, Inc. Systems and methods for multiple mode voice and data communications using intelligently bridged TDM and packet buses and methods for performing telephony and data functions using the same
DE19829822A1 (en) 1998-07-03 2000-01-05 Siemens Ag communications system
US6731627B1 (en) * 1998-11-17 2004-05-04 Cisco Technology, Inc. Virtual loop carrier system
US6614781B1 (en) * 1998-11-20 2003-09-02 Level 3 Communications, Inc. Voice over data telecommunications network architecture
US20010046209A1 (en) * 1998-12-31 2001-11-29 David N. Glassman Database workflow for multimedia networking and voip
US6765931B1 (en) * 1999-04-13 2004-07-20 Broadcom Corporation Gateway with voice
GB2350521B (en) * 1999-04-30 2001-07-11 Nokia Corp A gateway arrangement
US6980544B2 (en) * 1999-07-14 2005-12-27 Telefonaktiebolaget Lm Ericsson (Publ) Combining narrowband applications with broadband transport
US6865220B2 (en) * 2000-02-11 2005-03-08 Lsi Logic Corporation System and method for implementing an end-to-end error-correcting protocol in a voice band data relay system
US7006489B2 (en) 2001-02-23 2006-02-28 Santera Systems, Inc. Voice packet switching system and method
US7830864B2 (en) * 2004-09-18 2010-11-09 Genband Us Llc Apparatus and methods for per-session switching for multiple wireline and wireless data types

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5375121A (en) 1991-08-28 1994-12-20 Fujitsu Limited ATM cell assembling and disassembling system and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"NARROWBAND SERVICES OVER ATMNETWORKS:EVALUATION OF TRUNKING METHODS". SINGER J ET AL.ISS'97 WORLD TELECOMMUNICATIONS CONGRESS,Vol.2 . 1997
"VOICE OVER ATM: A HYBRID TDM/ATMDESIGN APPROACH". LAURENCE M ET AL.ELECTRONIC ENGINEERING,Vol.71 No.869. 1999

Also Published As

Publication number Publication date
US7006489B2 (en) 2006-02-28
US20040213205A1 (en) 2004-10-28
EP1364499A2 (en) 2003-11-26
EP1364499B1 (en) 2009-07-01
US7593415B2 (en) 2009-09-22
DE60232781D1 (en) 2009-08-13
WO2002069588A9 (en) 2003-01-30
CN1504039A (en) 2004-06-09
US20060092927A1 (en) 2006-05-04
WO2002069588A2 (en) 2002-09-06
WO2002069588A3 (en) 2003-04-10
AT435550T (en) 2009-07-15

Similar Documents

Publication Publication Date Title
US6611531B1 (en) Method and apparatus for routing integrated data, voice, and video traffic
US5613069A (en) Non-blocking packet switching network with dynamic routing codes having incoming packets diverted and temporarily stored in processor inputs when network ouput is not available
US6954453B1 (en) Method for transmitting data in a telecommunications network and switch for implementing said method
EP0883324B1 (en) Method and interface for connecting communication traffic between narrowband and broadband networks
CA2292315C (en) Universal optical network unit for use in narrowband and broadband access networks
CN1152536C (en) Method for optimizing mobile radio communication with transmission over multiple interconnection networks
CA2334927C (en) Digital packet network for the local access loop
US6385193B1 (en) Wan-based gateway
US9544080B2 (en) Switching architecture with packet encapsulation
AU777645B2 (en) Circuit emulation service over an internet protocol network
EP0690653B1 (en) Asynchronous transfer mode (ATM) transport of voice-band signals
US7961739B2 (en) Systems and methods for voice over multiprotocol label switching
US7436767B1 (en) Method and apparatus for controlling the transmission of cells across a network
US6765912B1 (en) Network resource usage in call sessions
US5526353A (en) System and method for communication of audio data over a packet-based network
EP0923211A2 (en) System and method for packet network trunking
US8175083B2 (en) Method for transmitting data in a telecommunications network and switch for implementing said method
US8509114B1 (en) Circuit emulation service over IP with dynamic bandwidth allocation
EP1217804B1 (en) Interworking of dissimilar packet networks for telephony communications
JP4067133B2 (en) Two-way video communication over packet data network
JP3291122B2 (en) Self-routing exchange, atm exchange and exchange system
US6763017B1 (en) Method and apparatus for voice port hunting of remote telephone extensions using voice over packet-data-network systems (VOPS)
US20020150100A1 (en) Method and apparatus for adaptive frame fragmentation
CN100496040C (en) System and method for enhancing voice channel transmitting by means of intranet protocol
US6009100A (en) Asynchronous transfer mode switching system

Legal Events

Date Code Title Description
C06 Publication
C10 Request of examination as to substance
C14 Granted
C41 Transfer of the right of patent application or the patent right
C56 Change in the name or address of the patentee

Owner name: GENBANDE CO., LTD.

Free format text: FORMER NAME: SANTERA SYSTEMS INC.